Boiler



BOILER Filed Jan. 5, 1931 2 Sheets-Sheet l m m \\L\ INVENTOR iz m/ RimMme ATTRNEY July 11, 1933. J. RINNE 1,917,664

BOILER Filed Jan. 5. 1931 2 Sheets-Sheet 2 OOOOOOOOOOOO INVENTOR JohnRimme ATTORNEY Patentedluly 11, 1933 UNITED STATES PATENT OFFICE JOHNRINNE, F UPPER DARBY, PENNSYLVANIA, ASSIGNOB TO THE BA'BCOOK 86 W'ILCOXCOMPANY, OF BAYONNE, NEXV JERSEY, A CORPORATION OF .NEW JERSEY BOILERApplication filed January 5, 1931. SerialINo. 506,568; g

This invention relates to water tube boilers, and more particularly towater tube boilers characterized by multiple gas passes in which one ofthe passes isthrough gas tubes disposed interiorly of the water tubes.

One of the objects of my'inventionj is the provision in a! steam boilerof the character described of a special bailie arrangement providing aneffective flow of heating gases 0 across the combination tubes andaheating gas outlet at a location insuring a'desirable distribution ofthe heating gasesto the gas tubes, while affording a compact boilerstructure.

Other objects will be apparent to those skilled in this particular artfrom the description in the specification in connection with theappended drawings, in which- 7 Fig. 1 is a side elevation partly insection, of a boiler illustrating theinvention;

Fig. 2 is an enlarged side elevation, partly in section, of a structuraldetail of the 1nvention; r

Fig. 3 is an end view, in section,'of a boller taken along the line 3--3of Fig. 1.

In the embodiment of the invention chosen for purposes of illustration,a drum 1 is connected by means of nipples 2 todowntake headers 3. Oneend of tubes 4 is connected G to the downtake headers 3 and the otherend.

thereof is connected to uptake headers 5.

The tubes 4 are compound and include an outer tube 40 and an inner tube35. These tubes are so arranged with respect to each other and theheaders 3 and 5 that the tube 35 is open to the hot gases of combustionin the boiler which will sweep therethrough,

and the heat absorbing fluid (which may be water) used in the operationof the boiler is contained in the space between the two tubes.

A row of tubes 8 connected to both rows of headers 3 and 5 are plainwater tubes. Be-

F low the row of tubes 8 is another row of water tubes 9 connected atone end in the headers 5; these tubes extend parallel to the tubes 4 and8 for a portion of their length and are then curved downward at 10, andthe other end is expanded in downtake headers 11 which are connectedtothe downtake headpleting' the steam ers 3 by-ineans of nipples 12,Steam and water circulators' 6 connect the upper ends of theuptakeheaders 5 with the drum 1, comand water circulatory sys tem. v p Ia A mud drum 13 is connected'with the headers 11 by means of nipples 14.Battling 17, made of suitable refractory material, is supported by thetubes 4 and 8 in its upper portion, and itslowerportion 18 rests uponand is supported by the curved portion of the tubes 9. f

- A combustion chamber 20 is formed below a the steam generating tubes4, 8 and 9 by the walls of the boiler setting. Front wall 21 of theboiler casing extends upwardfrom the boiler setting and forins a gaschamber 22 atone end of the tubes, the gas chamber being boundedby thewall and the headers 3. Another wall 23 of the boiler casing forms withthe headers 5 a second gas 01121111 ber 24. The walls 21 and 23 aresubstantially vertical and make, with their respective inclined headers3 and 5, gas chambers of substantially trapezoidal cross section soarranged as to insure equalization of the gases through the gas tubesduring normal operation of the boiler.

Superheater tubes are disposed in the up per portion of the boiler andare expanded in superheater headers 26, 27, 28 and 29 which are locatedoutside of the path of the gases of combustion and are partiallyshielded therefrom by the nipples 2. p

In the operation of this boiler, the gases of combustion from thecombustion chamber 20 sweep across the tubes 9, 8 and 4 in a pass formedby the baffle 17 and the headers 5. These gases then sweep across thesuperheater tubes and down across the tubes 4 the usual manner. Theinner tube 35 extends through the tube40 and through the header and isseated in an auxiliary seat portion 37 which is fitted in the outer wallof the header and secured by a suitable nut 38. This constructionprovcles an annular chamber between the tubes 40 and 35 which receiveswater from the header. The tube 35 is open to the gas chamber 22 and thegases of combustion delivered to the combustion chamber flow therethrough. l

The other end of tube 40 is expanded in the inner face of header 5 inthe usual manner, and the tube 35 is expanded in a plate 41 bolted tothe outside face of the header 5. This manner of connecting the tubeswith theheader is such that steam and water may circulate in the annularchamber between the tubes 35 and 40, while the tube 35 is open to thegas chambers 22 and 24 so thatthe gases of combuston will flowtherethrough. W'hile this manner of connecting the tubes is convenientand effective, and is-such that they may be readily removedat any time Pthat a replacement is necessary, a specific manner of connecting thecompound tubes is not contemplated as a part of this invention.

From the foregoing description itis apparent that this inventionprovides a multi-.

# ple pass boiler which'is compact and in which the effectiveness ofheat transfer is extremely high, as an additional he'atabsorbi'ngsurface exposed to the hot gases of combuston is pro vided in the samespace ordinarily taken up by water tubes alone, and while a specificembodiment of the invention has been described in some detail, it isunderstood that substitutions, changes and additions may be made thereinwithin the spirit of the invention as limited by the appended claims.

What I claim is l. A water tube boiler including a bank of inclinedtubes with gas tubes located therein; a lower row of water tubes locatedbelow the bank of inclined tubes and above a'combust-ion chamber, saidlower row of tubes being curved downward at one end; a battle supportedby said lower row of tubes and resting on the curved part thereof,constructed to direct gases of combustion from the combustion chamberacross said tubes in at least two directions, and thence through theinteriorly located gas tubes.

2. In a water tube boiler, a bank of inclined water tubes disposed abovea combustion chamber and having uptake and downtake headers connectedtherewith, a boiler casing associated with said tubes and headersforming a gas space at the ends thereof,

gas tubes located inside certain of the water tubes, a lower row ofwater tubes bent downward at one end, a bafiie associated with thetubebank covering the lower row of tubes at the bent portion thereof andbeing supported thereby; the tubes, bafliing and gas spaces being soarranged that gases of combustion Wlll be directed across the tubes atleast twice, and thence through the gas tubes. I

' JOHN RINNE.

